pb with GORDON surfaces

 From:  lorem (LOREMBOLO)
1191.1 
Hi,

I must be stupid, cause I don't really understand Gordon surfaces...and the way it works..
:(
here is a chair I want to model. The lines are explicits to see the desired volume.



But I can't achieve to make a gordon surface with these splines....
Do you know how I must do ?

Thx in advance for help...

3dm scene attached
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